Ever find yourself stumped when you need to work out percentages?  This simple how-to guide takes you through it step by step, and gives shortcuts for calculating “common” percentages, e.g. 10%, 20%, 25%, 50% and 75%.  What’s more, you’ll often find that you can do it without a calculator!

http://hubpages.com/hub/Working-out-percentages-finding-how-to-do